Quick Summary
Sildenafil (Viagra)
Short-acting PDE5 inhibitor.
Duration: 4–6 hours
Use: As-needed
Food: High-fat meals may delay effect
Tadalafil (Cialis)
Long-acting PDE5 inhibitor.
Duration: up to 36 hours
Use: As-needed or daily
Food: Minimal interaction
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Comparison Table
| Feature | Sildenafil | Tadalafil |
|---|---|---|
| Onset | 30–60 min | 30–60 min |
| Duration | 4–6 hours | Up to 36 hours |
| Daily use | No | Yes |
| Food interaction | Moderate | Low |
Find the Right ED Medication
Compare sildenafil and tadalafil treatment plans.
Compare sildenafil and tadalafil treatment plans.
Key Differences
Sildenafil is best for planned use and short duration. Tadalafil provides extended duration and more flexibility for spontaneous activity.
Both medications are PDE5 inhibitors but differ in pharmacokinetics and lifestyle suitability.
Frequently Asked Questions
Tadalafil lasts significantly longer, up to 36 hours, while sildenafil typically lasts about 4–6 hours.
Both medications usually start working within 30–60 minutes. Individual response may vary depending on food intake and metabolism.
Tadalafil is better for spontaneity due to its long duration of up to 36 hours, often called the "weekend pill".
Tadalafil can be prescribed in a low daily dose for continuous effect. Sildenafil is typically used only as needed.
Both medications have similar side effects such as headache, flushing, and nasal congestion. Tadalafil may cause fewer food-related interactions.
Yes, but switching should be done under medical guidance to ensure safe dosing and avoid overlapping effects.